Georges Elencwajg

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Name	Georges Elencwajg
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29

32

votes

4

answers

4k

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Slick proof?: A vector space has the same dimension as its dual if and only if it is finite dimensional

linear-algebra slick-proof

feb 15 at 15:35 GHH 7●2

13

29

votes

2

answers

1k

views

When is a singular point of a variety smooth?

ag.algebraic-geometry singularity-theory

jun 29 at 12:38 Georges Elencwajg 24.3k●65●132

9

27

votes

2

answers

1k

views

A closed subscheme of an open subscheme that is not an open subscheme of a closed subscheme?

ag.algebraic-geometry schemes

jan 29 10 at 12:53 Clark Barwick 2,927●13●18

15

27

votes

56

answers

7k

views

What are examples of mathematical concepts named after the wrong people? (Stigler’s law) [closed]

ho.history-overview names big-list

jul 9 11 at 2:21 Adam Azzam 99●6

26

27

votes

2

answers

2k

views

Hirzebruch’s motivation of the Todd class

generating-functions at.algebraic-topology

sep 27 at 19:10 John McKay 173●2

15

25

votes

3

answers

2k

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Does “finitely presented” mean “always finitely presented”? (Answered: Yes!)

ac.commutative-algebra ag.algebraic-geometry

feb 25 10 at 22:41 BCnrd 4,116●1●38●58

20

23

votes

6

answers

2k

views

Why is addition of observables in quantum mechanics commutative?

quantum-mechanics intuition

jan 3 12 at 17:50 Fabien Besnard 73●6

27

20

votes

24

answers

4k

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Are there any books that take a ‘theorems as problems’ approach?

mathematics-education

jan 27 at 10:51 Guy R. 1●1

28

20

votes

6

answers

2k

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“Points” in algebraic geometry: Why shift from m-Spec to Spec?

ag.algebraic-geometry

dec 16 10 at 20:59 Marc Nieper-Wißkirchen 1,313●5●15

11

20

votes

2

answers

1k

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Ring-theoretic characterization of open affines?

ac.commutative-algebra ag.algebraic-geometry schemes

apr 27 10 at 13:25 Martin Brandenburg 29.1k●2●46●130

12

18

votes

5

answers

2k

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To prove the Nullstellensatz, how can the general case of an arbitrary algebraically closed field be reduced to the easily-proved case of an uncountable algebraically closed field?

ac.commutative-algebra

jan 6 at 18:08 Martin Brandenburg 29.1k●2●46●130

12

17

votes

6

answers

2k

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Problem in Rick Miranda: finding genus of a Projective curve

riemann-surfaces ag.algebraic-geometry

apr 5 12 at 23:06 Steven Gubkin 6,163●2●25●63

22

16

votes

6

answers

3k

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Why are local systems and representations of the fundamental group equivalent

reference-request at.algebraic-topology ag.algebraic-geometry

may 3 at 14:30 Ko Ou 1

9

15

votes

2

answers

759

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Interpretation of elements of H^1 in sheaf cohomology.

ag.algebraic-geometry at.algebraic-topology

nov 20 11 at 18:51 Ben Webster♦ 20.7k●1●44●114

12

15

votes

2

answers

2k

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A finitely generated, locally free module over a domain which is not projective?

ac.commutative-algebra examples projective-module

feb 8 10 at 7:31 Pete L. Clark 39.6k●3●102●226